Wowpedia says that the ghoul gets 40% of our resilience. My fully buffed risen ghoul in raid has 206k health. That isn't exactly....durable. At 70% player resilience, they would have an effective HP of 263k. Add in armor of 47% and you get almost 500k ehp against melee. Thats reasonably tanky however magic damage ehp of only 263k is kindof low